I have the same problem with my 2013 Grand Cherokee with the 3.5 V6 Smell of burning oil inside the cockpit while driving.
@ben40 we don’t see the site where you saw this problem - could you please describe it a bit more so we may be of better help? Thanks.
Look for oil drips onto the exhaust system. If the valve cover gasket is leaking, oil can drop onto the hot exhaust where it burns, and then the smell enters the cockpit through the cabin vent system.
Bought mine brand new. Never had that problem. I DID experience my alternator burning up about 2 years ago. Scared the crap out of me. (but warrantee covered it)